The number system in general addition is called addend, and the result is called sum; Addition is to transfer so many addends into sum. This is different from the factor to be multiplied. In fact, during the Renaissance, many writers did not consider the first plus sign at all. Today, due to the nature of bonus exchange, "cannon" is rarely used, and these two terms are usually called addend.

Flexible learning and application of mathematics

Applying what we have learned can not only help us understand mathematical concepts more deeply, but also stimulate our interest in learning and increase our motivation to learn. For example, "becoming a millionaire in 20 days" sounds incredible, but if we propose that we can get paid for doing one thing, then we will only get 1 yuan on the day of 1, and then we will get twice as much as the day before, so this goal is easy to achieve. This is a good example of understanding exponential growth.